error about install parallel

[hanguojun007]

pak::pkg_install("parallel")
✔ Loading metadata database ... done
Error:
! error in pak subprocess
Caused by error in pkgplan_solve(self, private, match.arg(policy)):
! Error in dependency solver, cannot solve installation.
ℹ Solver status: -1.
ℹ This is an internal error in pkgdepends, please report an issue at https://github.com/r-lib/pkgdepends/issues.
Type .Last.error to see the more details.

.Last.error
<callr_error/rlib_error_3_0/rlib_error/error>
Error:
! error in pak subprocess
Caused by error in pkgplan_solve(self, private, match.arg(policy)):
! Error in dependency solver, cannot solve installation.
ℹ Solver status: -1.
ℹ This is an internal error in pkgdepends, please report an issue at https://github.com/r-lib/pkgdepends/issues.

---

Backtrace:

1. pak::pkg_install("parallel")
2. pak:::remote(function(...) get("pkg_install_make_plan", asNamespace("pak"))(...), …
3. err$throw(res$error)

---

Subprocess backtrace:

1. base::withCallingHandlers(cli_message = function(msg) { …
2. get("pkg_install_make_plan", asNamespace("pak"))(...)
3. prop$solve()
4. private$plan$solve(policy = private$policy)
5. pkgdepends:::pkgplan_solve(self, private, match.arg(policy))
6. base::throw(pkg_error("Error in dependency solver, cannot solve installation.", …
7. | base::signalCondition(cond)
8. global (function (e) …

[gaborcsardi]

parallel is a base package, it comes with R.